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G. GANDOLF O. ELECTRIC WELDI NG MACHINE.

APPLICATION FILED FEB. 28,19l8.

2 SHEETS-SHEET I.

@ (ad/ago gat r/ g G. GANDOLFO.

ELECTRIC WELDING MACHINE.

APPLICATION .HLED FEB. 28, 1918.

1 ,306, 959, Pafented June 17, 1919.

2 SHEETSSHEET 2- GIULIO GANDOLFO, OF SAMPIERDARENA, ITALY.

ELECTRIC WELDING-MACHINE.

Specification of Letters Patent.

Patented June 17, 1919.

Applcation filed February 28, 1918. Serial No. 219,653.

T all whom it may concern Be it known that I, GIULIO GANDOLFO, a subject of the King of Italy, and residing at 17 Corso dei Oolli, Sampierdarena, Province of Genoa, Italy, have invented certain new and useful Improvements in ElectricWelding-Machines, of which the following is a specification.

My invention relates to improvements in electric welding machines.

An important object of the invention is to provide a machine of the above mentioned character, the work holding elements or jaws of which are readily removable or interchangeable, the machine being reliable in Operation, and convenient to manipulate.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawingsformin a part of this specification an'din which like numerals are employed to designate likethis head through a pipe 25.

parts throughout the same, i

Figurel 1s a side elevation of a machine embodying my invention,

Fig.2 is an end elevation'of the same, and,

Fig. 3 is a partly diagrammatic view showlng the circuits included in the apparatus.

In the drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention the numeral 5 designates a transformer, embodying a primary coil 6 and a secondary coil 7. As clearly shown in Fig. 3, the primary coil 6 is suitably connected with a source of current 7,

and a resistance 8 is connected between the I coil 6 and source of current 7. The resistance may be operated for controlling the current passin to the primary coil, and thereby regulating the'degree of heat of the work. The resistance 8 may be of any well known or preferred construction and may be operated by turning a hand wheel 9. The resistance is shown supported within or by a frame 10.

Arranged upon the frame 10 are slides 11, adapted to move transversely thereof. These slides receive their movement by screw threaded engagement with a horizontal rotatable shaft 12, the screw threads of which are 0 positely pitched. The shaft 12 is turn by hand wheels 13, as shown. The slides 11 are hollow.

Arranged above the hollow slides 11 are hollow heads 14, as shown.

Electrodes l5 and 16 are secured to the slides 11, while electrodes 17 and 18 are secured to the heads 14. Jaws 19 are arranged between the electrodes and are suitably secured thereto. These jaws are removable and interchangeable. A hollow neck or elbow 20 is connected with each end of the primary coil 7, and conduits 2-1 are connected therewith. .These conduits are preferably formed of flexible stripped copper. One pair of conduits 21 is connected with the electrodes 15 and 17 while the other pair of conduits 21 are connected with the electrodes 16 and 18.

The numeral 22 designates the pieces of work to be welded.

A water supply pipe 23 leads into the lower end of each slide 11, to supply cooling water thereto. The water discharges from the slide 11 through a pipe 2 1, which leads into the corresponding upper head 14. The water discharges from the upper end of The operation of the apparatus is as follows: The pieces of work 22 are placed within p and held by the jaws 19, with their ends in end of the secondary coil 5, and through the conduits 21, in parallel. The current then passes through electrodes '15 and 17, 'aws 19 thereof, the piece of work 22 held y these jaws, the other piece of work, the other jaws 19, electrodes 16 and 18, conduits 21 connected therewith, and back to the opposite end of the coil 5. It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to, without departing from the spirit of my invention or the scope of the subjomed claims.

Having thus described my invention what I claim is:

1. In a machineof the character described, a. frame, slides arranged thereon for movenient toward and awe from each other, electrodes carried by t e slides, heads arran ed near and above the slides, electrodes earned by the heads, jaws arranged between the electrodes to receive and hold thework,

a transformer having primary and second-' ary coils, means for electrically connecting one pair of-elect'rodes in parallel with one end of the secondary coil, and means for connecting the other pair of electrodes in' parallel with the opposite end of the secondary coil. f f

' 2. In a machine of the character described, a frame, hollow slides arranged thereon,

means to shift the hollow slides towardand away from each other, hollow hea'ds'a ranged near and above the hollow slides, electrodes carried by the heads and slides, a-

transformer having a primary and secondary coil, a hollow member having electrical connection with each end of the secondary coil, a pair of conduits connected with each Witnesses:

SIRELLo GEROLAMO, JAMES J MURPHY, Jr. 

